This technical note addresses phase stability, loss stability, and shielding effectiveness in cable assemblies exceeding 20 feet. Stability and shielding effectiveness behavior of long length assemblies are not well documented due to the small number of requests for such assembly types and the lack of standardized test procedures. This document offers basic performance information pertaining to one specific type of Gore Microwave Coaxial Assembly (GMCA) which would typically be used in a test environment where occasional coiling/uncoiling and random movement would occur.